JP2001120668A - Clean cotton for medical treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide clean cotton for medical treatment wherein the water- absorbency is favorable, there is no flutting and fallen fibers on the surface, and the touch to the skin is gentle. SOLUTION: This clean cotton mainly comprises absorbent cotton. Then, constituent fibers of the clean cotton are entangled and integrated with each other by the action of a high pressure liquid current. At the same time, the clean cotton is impregnated with a cleaning chemical.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning cotton used for wiping and cleaning the skin during medical treatment.

[0002]

2. Description of the Related Art Conventionally, when wiping and cleaning skin in the medical field, for example, absorbent cotton impregnated with a chemical such as a disinfectant is used for wiping and cleaning the skin before performing injection or the like. Absorbent cotton is used because it has a high water absorbency, absorbs and retains a chemical solution well, has a soft touch, and is made of natural fiber cotton (cotton) and is therefore gentle on the human body. In addition, there is a rule that as a fiber constituting the absorbent cotton, a cotton fiber that has passed a purity test defined by an absorbent cotton test method of the Japanese Pharmacopoeia Law must be used.

[0003] However, since absorbent cotton is simply a collection of cotton fibers, when wiping for cleansing the skin,
Cotton fibers are more likely to fall off than absorbent cotton, and cotton fibers sometimes remain on the skin. In addition, when picking cotton wool with tweezers or the like, there is a problem that since the adjacent cotton wool is easily entangled by the fluff on the surface, other cotton wool may also be stuck together, resulting in poor workability.

In recent years, in order to improve the ease of use of this absorbent cotton, several sheets of absorbent cotton are stacked, passed through an embossing device (consisting of an embossing roll having surface irregularities and a flat roll having a smooth surface), and compressed. Clean cotton that is pressed down and integrated is used. However, although this clean cotton is pressed down by the protruding portion of the embossing roll, fibers that fall off due to friction with the skin at the time of wiping are generated, and the portion other than the portion pressed down by the protruding portion is generated. Had fluff, and the adjacent clean cotton was easily entangled with the surface fluff, and was easily sticked.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a clean cotton which has good water absorption, has no fluff on the surface and does not lose fibers, and has a soft touch to the skin.

[0006]

Means for Solving the Problems The present inventors have reached the present invention as a result of sharp studies to achieve the above object. That is, the present invention is a cleaning cotton mainly composed of absorbent cotton, wherein the constituent fibers of the cleaning cotton are entangled and integrated by the action of a high-pressure liquid flow, and are impregnated with a cleaning chemical. It is the gist.

[0007]

Next, the present invention will be described in detail.
The present invention is a clean cotton mainly composed of absorbent cotton. The absorbent cotton is a cotton fiber that has been subjected to a debinding treatment. In the present invention, fibers other than cotton fibers may be mixed as long as the purpose is achieved.

[0008] In addition to the defatted cotton fiber, a cotton linter can be preferably used as the fiber constituting the clean cotton of the present invention. As the cotton linter, short fibers remaining in cottonseed and having an average fiber length of 5 mm or less can be preferably used. If the average fiber length of the cotton linter exceeds 5 mm, the mobility due to the action of the high-pressure liquid flow tends to be inferior, and the fibers become entangled at the time of papermaking when producing a papermaking sheet, and the fibers are not dispersed and the A uniform sheet cannot be obtained.

[0009] Cotton linters have a much shorter fiber length than short fibers (usually of the order of 15 to 25 mm) such as cotton fibers, and therefore have much better mobility in the action of high pressure liquid flow. Therefore, when high-pressure liquid flow treatment is performed,
Even the energy of the low liquid flow can move well enough to get entangled in the fibers. Therefore, even with clean cotton having a high basis weight (more than 0.1 kg / m ² ), there is a cotton linter excellent in mobility and entanglement, so that the fibers can be sufficiently entangled with each other. Therefore, a product having practical mechanical strength can be obtained. Further, even at the pressure of the high-pressure liquid flow at that time, the entanglement can be sufficiently performed with relatively low hydraulic energy, which is advantageous in terms of cost.

[0010] Further, since the cotton linter has a crimp and a semicircular arc shape instead of a so-called linear shape, the linters are easily entangled with each other although the fiber length is short. Also, bulkiness can be imparted to the clean cotton,
It is possible to obtain clean cotton having a large inter-fiber space and a high liquid retaining property.

In the clean cotton of the present invention, the constituent fibers are entangled and integrated by the action of the high-pressure liquid flow. Since the constituent fibers are entangled with each other and pressed against each other, fluff is not easily generated on the surface of the clean cotton. Also, against the friction received when wiping the skin, fuzz is less likely to occur on the surface,
Also, the fibers do not fall off and remain on the skin. Also,
Since the fibers are integrated by entanglement, the flexibility is high.

The cleaning cotton of the present invention may be one in which the constituent fibers in the front and back layers and the inner layer are uniformly entangled and integrated. Those in which the entire clean cotton is uniformly entangled have uniform mechanical strength as a whole. Further, the entanglement of the constituent fibers present in the front and back layers may be particularly dense, and the entanglement of the fibers present in the inner layer may be lower than the entanglement degree of the fibers present in the front and back layers. As the entanglement of the constituent fibers becomes denser, the gap between the fibers becomes smaller, and the fibers become entangled and pressed, so that the fluff is less and the lint-free property against friction (the degree to which the fibers fall off) becomes better. By reducing the degree of entanglement between the fibers present in the inner layer, the gap between the fibers can be kept large, and the amount of the chemical solution impregnated in the clean cotton can be increased.

The action by the high-pressure liquid flow means that a water flow (high-pressure liquid flow) obtained by injecting water from an injection hole at a high pressure impinges. Specifically, the pore size is 0.05-2.
Using a device in which the injection holes of 0 mm are arranged in one or a plurality of rows with an injection hole interval of 0.05 to 10 mm, the liquid is injected from the injection holes at a pressure of 1.9 to 19.6 Mpa and placed on the support plate. Collision with the absorbent cotton. As the support plate, any structure may be used as long as the high-pressure liquid flow passes through the absorbent cotton and the support plate, and a mesh screen or a perforated plate may be used.
By appropriately selecting the structure of the mesh screen, the size of the mesh, and the like, the surface morphology of the clean cotton can be smooth, and a pattern or the like can be provided. In addition, since the high-pressure liquid flow passes through the absorbent cotton, if there is a foreign substance in the absorbent cotton, the high-pressure liquid flow penetrating through the absorbent cotton also drops off the foreign substance, so that a sanitary clean cotton free of foreign substances can be obtained. Can be.

The above-described fibers of the front and back layers are densely entangled with each other, and the clean cotton having a low entanglement degree of the fibers of the inner layer can be obtained, for example, as follows. After the high-pressure liquid flow is applied from one side of the absorbent cotton, the absorbent cotton is turned over, and the high-pressure liquid flow is applied from the other side to obtain the liquid.

Absorbent cotton subjected to a high pressure liquid stream is simply a collection of discrete fibers. When a high-pressure liquid flow collides with the discrete fibers, the energy of the liquid flow is converted into the kinetic energy of the fibers and the fibers move,
Entangled and integrated. When a high-pressure liquid stream is made to impinge on a high-weight (0.1 kg / m ² or more) such as absorbent cotton used in the present invention, the energy of the liquid stream is consumed by the movement of the surface fibers, and When the fibers reach the inner layer, there is not enough liquid flow energy left to allow the fibers to actively move and densely entangle. Furthermore, when the liquid flow collides, the fibers on the surface layer of the absorbent cotton are entangled with each other to form a dense structure.The dense surface layer acts as a barrier and repels the water flow, consuming the liquid flow energy and depleting the liquid flow energy. When the liquid flow reaches, there is no remaining energy high enough to actively move the fibers, so that the entanglement of the fibers in the inner layer is not as dense as the surface layer. Continued
Invert the absorbent cotton that one surface layer is densely entangled with,
By applying the high-pressure liquid flow from the other surface, only the surface layer is densely entangled in the same manner, and the fibers of the inner layer can have a low entanglement degree.

When the cotton linter is contained in the clean cotton of the present invention, when the high-pressure liquid stream is applied,
It is preferable to use a sheet made of cotton linter. The papermaking sheet made of cotton linter is a paper-like sheet obtained by a conventionally known wet papermaking method using cotton linter as a main raw material, and fixed with cotton linter entangled, and has a certain degree of form stability. It is easy to handle and good in texture.

When applying the high-pressure liquid flow, it is preferable to spray a high-pressure liquid flow from the papermaking sheet side of a laminate obtained by laminating a sheet made of absorbent cotton and cotton linter.
This is because the cotton linter has a short fiber length and easily falls down with the high-pressure liquid flow from the holes of the support plate. When the high-pressure liquid flow is applied, the sheet made of cotton linter absorbs water and swells,
The entanglement between the cotton linters is released by the impact of the high-pressure liquid flow, and each cotton linter moves freely. on the other hand,
The cotton fibers that make up absorbent cotton also move freely, and these fibers (cotton linters, cotton fibers,
(Cotton linter and cotton fiber) are entangled and integrated as a whole.

The laminate to which the high-pressure liquid flow is applied may have a three-layer structure in which absorbent cotton is laminated on both sides of a sheet made of cotton linter.

The sheet made of cotton linter is
It is preferable that the basis weight is 0.03 to 0.1 kg / m ² . If the basis weight is less than 0.03 kg / m ² , a sheet having a uniform formation cannot be obtained in producing a sheet-like sheet. On the other hand, if the basis weight exceeds 0.1 kg / m ² , when the absorbent sheet is laminated on the paper-made sheet made of the cotton linter and subjected to high-pressure liquid flow treatment, the paper-made sheet made of the cotton linter and the constituent fibers of the absorbent cotton are three-dimensionally formed. Entanglement is not sufficient, and it is difficult for the whole to be integrated. Therefore, the basis weight of the cotton linter used for the clean cotton of the present invention is preferably in the range of 0.03 to 0.1 kg / m ² , more preferably 0.05 to 0.08 k / m ^2.
g / m ² .

When the clean cotton contains cotton linter, the mixing ratio of cotton linter and absorbent cotton is preferably in the range of cotton linter: absorbent cotton = 0: 100 to 70:30 (% by weight). When the mixing ratio of the cotton linter exceeds 70% by weight, the mechanical strength of the obtained clean cotton tends to be inferior. During the high-pressure liquid treatment, the cotton linter is apt to fall off, resulting in a poor yield and poor productivity.

The basis weight of the clean cotton present invention (a state free of liquid medicine) is preferably from 0.1 kg / m ² or more, more preferably 0.15~0.2kg / m ^2. 0.1kg /
If it is less than m ² , the cleaning cotton has a small thickness, and the amount of the liquid medicine retained tends to decrease.

The bulk density of the clean cotton of the present invention is 130 kg /
It is preferably at most m ³ . The bulk density is 130kg /
If it exceeds m ³ , the space between the fibers will be small, and the amount of holding the chemical solution tends to decrease.

The tensile strength of the clean cotton of the present invention is 50 N / 5.
It is preferably at least a cm width. If the width is less than 50 N / 5 cm, it is difficult to maintain the shape due to the frictional force when wiping the skin, and it is inconvenient to use. In addition, dropped fibers are generated and remain on the skin.

The cleaning cotton of the present invention is obtained by entanglement of the constituent fibers of the above-described absorbent cotton and is impregnated with a cleaning chemical. The cleaning chemical is not particularly limited, and may be one that is usually used for cleaning the skin in the medical field.

[0025]

Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. (1) Weight (kg / m ² ): 10 samples from standard condition
After making a total of 10 sample pieces of 10 cm × 10 cm width to reach equilibrium moisture, the weight (kg) of each sample piece was weighed, and the average value of the obtained values was measured per unit area (m ² ). It was converted to the basis weight (kg / m ² ).

(2) Bulk density (kg / m ³ ): sample width 10
cm, a sample length of 10 cm, 5 pieces were prepared, and 0.03 N / c was measured with a thickness measuring instrument (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.).
The thickness (mm) of each sample was measured by applying a load of m ² , the average value was defined as the thickness (mm), and the value obtained by the following equation was defined as the bulk density of the clean cotton. Bulk density (g / cc) = [basis weight (kg / m ² ) / thickness (m
m)] / 1000

(3) Tensile strength (N / 5 cm width): JIS
-Measured according to the method described in L-1096A. That is, ten test pieces having a sample length of 15 cm and a sample width of 5 cm were prepared in the machine direction (MD) of the clean cotton, and for each sample piece, a constant-speed elongation type tensile tester (Orientec) in the MD direction of the clean cotton. The sample was stretched at a pulling speed of 10 cm / min by using Tensilon UTM-100 (manufactured by TOSHIBA CORPORATION) at a gripping interval of 10 cm between samples. And the obtained cutting load value (N / 5 cm width)
Was defined as the tensile strength (N / 5 cm width). In addition, the sample was in a dry state (a state where no water was retained) and a water retention rate of 20%.
The state maintained at 0% by weight was prepared and measured.

(4) Lint-free property: cleanliness class 10
0, in a clean box (Inside Seideido Round Clean Booth RCB-100) with a ventilation volume of 1.9 m ³ / min.
The measurement was performed using a dust counter (Dan Kagaku 82-3200N) having a measured particle size of 0.3 μm or more and an intake air amount of 2.8 L / min. Four sets of four specimens each having a width of 10 cm and a length of 10 cm were stacked to form one set, and three sets were prepared. After rubbing this sample in the above-mentioned clean box for 1 minute, further rub it for 1 minute, measure the total number counted in the dust counter, calculate the average value of 3 sets, and evaluated. ：: The total number was less than 40. ×: The total number exceeded 40.

(5) Water absorption (mm / 10 minutes): JIS-
It was measured according to the Bilek method described in L-1096.

(6) Water retention (weight%): width 2.5 cm,
Five sample pieces each having a sample length of 20 cm are prepared, the weight of the sample is measured in advance, and then immersed in distilled water for 10 minutes. Thereafter, the sample was taken out and weighed after hanging for 10 minutes. The measured value was applied to the following equation to calculate the water retention. Water retention (% by weight) = (Y−X) × 100 / X In the above formula, X is the weight of the sample, and Y is the weight after immersion in distilled water and hanging down.

(7) Compression bristles (N): sample length is 10c
m, a sample width of 5 cm, a total of 5 sample pieces are created, and each sample piece is bent in the lateral direction to form a 5 cm high cylindrical object, and the end of each is joined to measure the compression bending resistance. A sample was used.
The sample used was kept at a water retention of 200% by weight. Next, a constant-speed elongation type tensile tester (Tensilon UT manufactured by Orientec Co., Ltd.)
M-4-1-100), and compression was performed at a compression rate of 5 cm / min, and the average of the obtained maximum load values (N) was defined as the compression stiffness of the nonwoven fabric. The smaller the compression bending resistance, the higher the flexibility.

(8) Abrasion resistance (grade): Using a Gakushin type friction tester, visually observe the results measured according to JIS-L-1096 6.17.3 [Method C] Taber type method]. The nonwoven fabric surface was not abraded and no fluff was observed, and the nonwoven fabric surface was classified into Class 5, the nonwoven fabric surface with severely worn fluff was classified into Class 1, and the intermediate one was classified into Class 4 or 2, and evaluated in a total of 5 grades. The number of reciprocating friction was set to 100 times. The sample has a water retention of 2
What was kept at 00% by weight was used.

Example 1 A random card web having a basis weight of 0.15 kg / m ² was prepared using bleached cotton having an average fiber length of 25 mm. The web is placed on a moving 100-mesh metal net, and a high-pressure liquid flow of 4 Mpa is injected from a position 50 mm above the web using orifice heads arranged in a row with a hole diameter of 0.6 mm. Preconfounding was performed. Subsequently, a high-pressure liquid flow having an injection pressure of 12 Mpa was injected to perform a confounding process. Thereafter, the liquid was turned over, and a high-pressure liquid flow having an injection pressure of 12 Mpa was injected from the opposite side, and the opposite side was also subjected to the entanglement treatment. After the confounding treatment, excess water was removed by a mangle, which is a known water removing device, and then dried at 90 ° C. using a suction band type dryer.

Example 2 As a sheet made of cotton linter, a cotton linter having an average fiber length of 3 mm was used.
A sheet of 5 kg / m ² was produced. On the other hand, using bleached cotton having an average fiber length of 25 mm, a basis weight of 0.1 g /
you create a random card web of the m ^2.

A laminate in which a sheet of paper is laminated on a card web is obtained, and the laminate is placed on a 100-mesh metal net which moves the laminate so that the side of the sheet of paper is facing upward, at a position 50 mm above the laminate. A high-pressure liquid flow having an injection pressure of 4 Mpa was injected to perform pre-entanglement. Subsequently, the injection pressure 7Mp
The high-pressure liquid flow of a was injected to perform the confounding treatment. Thereafter, the liquid was turned over, a high-pressure liquid flow having an injection pressure of 7 Mpa was jetted from the opposite side, and the opposite side was also subjected to entanglement processing. After the confounding treatment, excess water is removed by a mangle, which is a known water removal device, and then a suction band dryer is used to remove excess water.
A drying treatment was performed at ℃.

Example 3 Example 3 was carried out in the same manner as in Example 1, except that the injection water pressure after the pre-entanglement was changed to 10 Mpa.

COMPARATIVE EXAMPLE In Example 1, a random card web having a basis weight of 0.1 kg / m ² was passed through an embossing device composed of a flat roll and an embossing roll, at a roll temperature of 150 ° C., a compression area ratio of 14.9%, and a compression point. Density 21.9 / cm ² , linear pressure 4
Partially thermocompression-bonded under the condition of 90 N / cm to obtain clean cotton.

The physical properties of the obtained clean cotton (in a state not impregnated with the liquid) and the physical properties in a state of retaining water obtained in Examples 1 to 3 and Comparative Example are shown in Table 1.

[0039]

[Table 1]

As is clear from Table 1, Examples 1 to 3 were used.
In all of the above, the constituent fibers are entangled and integrated by the action of the high-pressure liquid flow, and the constituent fibers are held together by entanglement.Therefore, there is almost no fluff on the surface of the clean cotton, and the mechanical strength is high. , Abrasion resistance and lint-free properties. In particular, the clean cotton of Example 3 was one in which the fibers present on the front and back surfaces were more closely entangled and had less fuzz on the surface than the entanglement of the constituent fibers of the inner layer.

On the other hand, in the case of the comparative example, which is partially compressed by applying pressure, the constituent fibers are simply arranged, so that the surface has many fluffs and the mechanical strength is low. It was inferior in wear resistance and lint-free property.

[0042]

According to the present invention, the cleaning cotton is mainly made of absorbent cotton, and the constituent fibers of the cleaning cotton are entangled and integrated by the action of a high-pressure liquid flow and are impregnated with a cleaning chemical. Since the constituent fibers of the clean cotton are entangled with each other and pressed against each other, fluff is unlikely to be generated on the clean cotton surface. Therefore, when using the clean cotton, the adjacent clean cotton does not stick together when pinched with tweezers or the like, and the workability is improved.
Also, against the friction received when the skin is wiped, fluff is unlikely to be generated on the surface, and the fibers do not fall off and remain on the skin. Since the fibers are integrated by being entangled with each other, the fibers have high flexibility and are friendly to the human body.

Further, since the high-pressure liquid flow is employed as the entanglement means, the high-pressure liquid flow passes through the cotton wool at the time of the confounding treatment. The high-pressure liquid flow penetrating through also removes foreign substances together, so that sanitary clean cotton free of foreign substances can be obtained.

Continuation of front page (72) Inventor Noriaki Bandai 4-3-1 Kutaro-cho, Chuo-ku, Osaka City, Osaka Prefecture Unitika Corporation F-term (reference) 2D034 CC00 4L047 AA08 AB02 BA04 CA19 CB07 CC03 DA00

Claims (3)

[Claims] 1. A medical cleaning cotton, which is a cleaning cotton mainly made of absorbent cotton, wherein the constituent fibers of the cleaning cotton are entangled and integrated by the action of a high-pressure liquid flow and impregnated with a cleaning chemical. 2. The method according to claim 1, wherein the fibers present in the front and back layers of the clean cotton are densely entangled, and the entanglement of the fibers present in the inner layer is lower than the degree of entanglement of the fibers present in the front and back layers. Medical clean cotton according to 1. 3. The medical cleaning cotton according to claim 1, wherein the constituent fibers of the cleaning cotton include a cotton linter having a fiber length of 5 mm or less.